New York’s attorney general is investigating Bank of America’s $8.5 billion settlement over losses in mortgage-backed securities, and has sought data from 20 institutional investors that agreed to the accord.

In letters to the firms, Attorney General Eric Schneiderman requested the names of clients — including pension funds, government authorities and charities affiliated with the state — that invested in securities issued by the 530 mortgage securitization trusts covered in the accord. He also sought the par and current market values of the clients’ securities.

The letters are dated July 7, and were sent in connection with the attorney general’s “ongoing investigation” into the securitization of residential mortgages. Schneiderman requested that the information be provided by July 14.

Among the investors were BlackRock and MetLife. Of the 22 investors that agreed to the accord, only the Federal Reserve Bank of New York and the Federal Home Loan Banks were not sent letters by Schneiderman.

Schneiderman’s office and representatives of Bank of America and BlackRock declined to comment.

A MetLife spokesman said that insurer has not seen a letter from Schneiderman. Pimco did not immediately respond to a request for comment.